Brush-holder for magnetic chucks



F. L. SIMMONS.

BRUSH HOLDER FOR MAGNETIC CHUCKS.

APPLICATION FILED JAN- 6, I919.

Patented Jan. '11, 1921.

S nuewto'c 3 SHEETS-SHEET l.

il bll i q F- L, SlMMONS,

BRUSH HOLDER FORMAGNETIC CHUCKS.

APPLICATION HLED JAN-6. 1919.

1 3 5 2 5 Patented Jan. 11, 1921.

3 SHEETSSHEET 2- 3 wuewto'o F. L. SIMMONS.

BRUSH HOLDER FOR MAGNETIC CHUCKS.

APPLICATION FILED JAN. 6. l9l9.

1,865,%85, Patented Jan. 11, 1921.

3 SHEETSSHEET 3.

UNITED STATES PATENT OFFICE.

FRANK L. SIMMONS, 0F WOONSOCKET, RHODE ISLAND, ASSIGNOR TO THE TAFT- PEIRCE MANUFACTURING COMPANY,

PORATION OF RHODE ISLAND.

Application filed January 6, 1919.

To all whom it may concern:

Be it known that I, FRANK L. SIMMONS, a cltizen of the United States, residing at VVoonsocket, in the county of Providence, State of Rhode Island, have invented certain new and useful Improvements in Brush-Holders for lVlagnetic Chucks, of which the following is a specification.

This invention relates broadly to electrical appliances and more particularly to a brush holder for a rotary magnetic chuck or the like.

The principal object of the present invention is to provide a brush holder wherein individual contact members are maintained, under yielding pressure, against suitable rings or COFflHlUtZttOIS; and wherein the 0011- tact members are carried by a covered memher so as to be protected, and are mounted on adjustable supports adjacent the collector rings or commutator.

A further object of the present invention is a brush holder of the character specified wherein the said holder is adj ustably mounted so that the holder may be extended or withdrawn more or less through the su port, and then may be fixedly clamped in such extended or withdrawn positions, as may be desired.

Another and important object of the present invention is a brush holder of the character specified wherein the mounting for the brush holder is constructed so that the body of the holder may be rotated in order to bring the brushes into proper contact with the collector rings or commutator.

A still further and equally important object of the present invention is a brush holder of the character specified mounted in such manner as to be capable of a swinging adjustment relative to said mount whereby the holder head may be raised or lowered, or arranged in an angular position to the collector rings or commutator of a rotary chuck or the like, in order to bring the brushes into proper relation to the collector rings or commutator.

A still further object of the present invention is a brush holder of the character specified comprising a support adapted to be secured to a machine frame and a swinging clamp carried by said support in such manner that the brush-holding member may be arranged in various angular positions and Specification of Letters Patent.

F XWOONSOCKET, RHODE ISLAND, A COR- BRUSH-HOLDER FOR MAGNETIC CHUCKS.

Patented Jan. 11, 1921.

Serial No. 289,735.

with the holder capable of adjustment to and from the clamp bracket as well as being capable of a rotary adjustment within the clamp bracket.

ii still further object of the present invention is a brush holder of the character specified adapted to be mounted on the back of a suitable machine frame and a cable electrically connecting the brush holder with the switch mounted on the front of the machine frame.

This invention possesses many other and advantageous features, some of which, together with the foregoing, will be set out more at length in the following description wherein will be outlined in full that form of the invention which. has been selected for illustration in the drawings accompanying and forming a part of the present specification.

In the drawings and in the specification I have described the preferred form of my generic invention, it being understood that I do not limit myself to such form because 1y invention may be embodied in a multi plicity oi forms each being a species of my invention, it being understood by the claims succeeding the description of my invention that I desire to cover the invention in whatsoever form it may be embodied or practised.

Figure 1 is an elevational view of the mounting oi the brush holder upon a suitable machine frame.

Fig. 2 is also an elevational view looking at the side of the machine frame and at the end of the brush holder.

Fig. 3 is a sectional view of the brush holder head.

Fig. i is a sectional View taken on line A-B of Fig. 3.

Fig. 5 is a view illustrating more or less diagrammatically certain of the possibilities of adjustment capable of being attained by use of the present invention.

Heretofore in the art of rotary chucks it has been customary to provide spring contacts, that were open and exposed, which were mounted on specially constructed bases for each particular type of machine on which the chuck was used. In many cases these mountings were provided by the user of the chuck, with the result that the rigidity of such mountings and the effective 0peration of such mountings varied with the skill and ability of the user to fit up his particular chuck. Since the holding power of the magnetic chuck is dependent upon the chuck being fully electrically energized, it is evident that a poor brush mount is apt to cause variation, or even breakage, of the current and consequent slippage or loss of the work from the chuck face. It is apparent that since magnetic chucks are usually utilized on high grade work which is being brought to substantially exact dimen sions, that either the slippage or the loss of the work from the chuck may very often injure or ruin an expensive piece of work, as Well as being apt to injure the workman, and the machine. Where such chucks are used on grinding machines, there is also a possibility of the loosened work becoming jammed between the face of the chuck and the grinding member thereby tending to cause the bursting of the high speed grinding wheel and consequently contributing to serious accidents.

The present invention overcomes the chiliculties of'the known prior art by providing a strong, rigid brush mount so constructed as to be capable of a great many variations of adjustment so that the mount for brush carrier becomes substantially universal construction adapted to be set on practically all of the machines on which magnetic chucks are used. This brush holder and support are of such character as to insure a uniform contact between the brush and the collector rings or commutator under the most severe conditions of use, and the electrical elements of the brush holder are thoroughly protected so that there is little *danger of short circuits by tools or \VOIK being brought into contact with the brush holder.

The brush holder furthermore is constructed to be mounted on the rear part or back of a suitable machine frame with the controlling switch mounted on the front of a suitable machine frame whereby the control is convenient to the workman at the same time the electric circuit members are disposed out of the way of the workman.

Referring now more particularly to the drawings, the supporting arm 1 is adapted to be secured to a suitable machine frame 2 by means of stub screws or other securing members. This supporting arm 1 is preferably curved, and carries on its upper end a clamp bracket 4. This clamp bracket is secured to the arm 1 by means of a clamp bolt 5 which serves as a pivot around which the clamp bracket may be swung and secured in adjusted positions by tightening the nut on the clamp bolt. The clamp bracket is pro vided with a sleeve portion 6 which is split. or'slotted, on one side, a clamp screw 7 passes through a lug 8 on one portion of the sleeve and is screw-threaded into the lower lug 9 on the other portion of the sleeve. A tubular member 10 is adapted to extend through the sleeve 6 and is constructed to be clamped within this sleeve by means of the clamp stub screw 7 The forward end of the tubular member 10 carries a brushholding head 11. This brush-holding head, shown in section in Figs. 3 and 4, comprises a body portion 12 formed of bakelite, condensite, or similar insulating material, and is constructed hollow to form a box-like member which is adapted to be closed by a suitable cover 1 1. The forward portion of this body member 12 is provided with a pair of openings through which extend brushes 15 and 16. These brushes may be of carbon, copper gauze, or any other material suitable for the purpose, and preferably are provided with heads 17, which are adapted to be seated against the inner side of the body portion. to prevent the brush being lost when the brush holder is removed from operative position as during shipment or adjustment. A pair of spring fingers l8 and 19 are mounted on the body portion 12 and extend over the heads of the brushes 15 and 16 so that the springs tend to force the brushes outwardly and are yieldable to permit the brushes to be pushed slightly inwardly. The spring fingers 1S and 19 are connected with suitable conductors 20 and 21. These conductors are connected to the terminals of a plug 22 which is adapted to cooperate with a connector 2 1 which carries a flexible cable 25, and is adapted to carry the electrical current to the brush holder. This cable connects through a plug 26 and connector 27, and connecting members, to a control switch 28, which preferably is mounted on the front of the machine frame 2. This control switch may be of any approved type but preferably is of the character shown in my co-pending application filed the 14th day of March, 1918, Serial No. 222,375. The brushes 15 and 16 are adapted to yieldingly bear against collector rings 29 and 30 of the magnetic chuck 31 which may be mounted on the spindle 32 of a suitable machine frame.

From the foregoing description it is obvious that the brush-holder head is capable of adjustments forwardly, backwardly, rotatively, and angularly up and down, relatively to the supporting bracket, so that one brush holder may be utilized to accommodate diiferent sized magnetic chucks or one brush-holder mount may be utilized to energize magnetic chucks mounted for rotation in different planes as is indicated in Fig. 5 of the drawings. Furthermore the mounting is such that it may be supplied with the chuck with the assurance that the mounting is adaptable to substantially all machines on which rotary magnetic chucks are used.

The dotted lines in Fig. 5 illustrate the flexibility of the brush holder herein shown, in that the dotted lines indicate a position to which the brush holder may be moved. In other words if the chuck were taken from the position shown in full lines where it is mounted 011 a vertical spindle and placed in the position indicated by the contact rings in dotted lines, that is on a horizontal spindle, the brush holder may be adjusted to serve the chuck in the latter position as well as when the chuck is in the former position.

Having described my invention, what I claim is 1. A brush holder for rotary magnetic chucks and the like comprising in combination a supporting bracket, an adjustable member mounted on said supporting bracket, a brush carrying device supported by said adjustable member and adapted to be ad justed rotatably relatively to said adjustable member, and electrical connections attached to said brush carrying device.

2. A brush holder for rotary magnetic chucks and the like comprising in combination a supporting bracket adapted to be secured to a machine frame, a brush holder comprising a hollow body portion provided with means to carry suitable brushes, said body portion having openings in one side thereof, brushes mounted in said brush holder and extending through said openings, an extension member upon which said body portion is mounted, and means operatively connecting said extension member with said bracket whereby said body portion may be adjusted relatively to said bracket in such manner that the said body portion may be positioned to properly engage the brushes carried thereby with contact members on the chuck to be energized.

3. A brush holder for rotary magnetic chucks and the like comprising in combination a'supporting bracket adapted to be secured to a machine frame, a brush holder comprising a body portion'provided with means to carry suitable brushes, brushes mounted in said brush holder, an extension member upon which said body portion is mounted, and pivoted means operatively connecting said extension member with said bracket whereby said body portion may be adjusted angularly relatively to said bracket in such manner that the said body portion may be positioned to properly engage the brushes carried thereby with contact members on the chuck to be energized.

4. A brush holder for rotary magnetic chucks and the like comprising in combination a supporting bracket adapted to be mounted on the bed of a suitable machine frame, a brush holder comprising a body portion adapted to carry suitable brushes, a supporting member for said body portion and to which said body portion is connected,

and adjustment means operatively connecting said member and said bracket whereby said body portion may be adjusted longitudinally, rotatively, or angularly relatively to said bracket to properly position the body portion in such manner as may be desired.

5. A brush holder for rotary magnetic chucks and the like comprising in combination a supporting bracket adapted to be mounted on the bed of a suitable machine frame, a brush holder comprising a hollow body portion adapted to carry suitable brushes, a supporting member for said body portion and to which said body portion is connected, and adjustment means comprising a split sleeve operatively connecting saic member and said bracket whereby said body portion may be adjusted relatively to said bracket to properly position the body portion in such manner as may be desired.

6. A brush holder for rotary magnetic chucks and the like comprising in combination a supporting base adapted to be mounted upon a suitable machine frame, a brush holder comprising a body portion having openings in one side thereof, brushes mounted. in said body portion, electrical connecting means operatively connected to said brushes, and means adjustably connecting said body portion to said base whereby said body portion may be adjusted to bring said brushes into proper relation to the contact members of a suitable magnetic chuck or the like.

'7. A brush holder for rotary magnetic chucks and the like comprising in combination a supporting base adapted to be mounted upon a suitable machine frame, a brush holder comprising a body portion, brushes mounted in said body portion, electrical connecting means operatively connected to said brushes, means comprising a slidable connection adjustably connecting said body portion to said base whereby said body portion may be adjusted slidably and rotatably to bring said brushes into proper relation to the contact members of a suitable magnetic chuck or the like.

8. A brush holder for rotary magnetic chucks and the like comprising in combination a base adapted to be mounted upon a suitable machine frame, a brush holder comprising a body portion provided with openings through which suitable brushes are adapted to extend, brushes extending through said openings, springs carried by said body portion and bearing upon said brushes in such manner as to normally urge said brushes outwardly through the said openings, electrical connecting m embers connected to said brushes, and means for slidably and rotatably connecting said body portion with the said base.

9. A brush holder for rotary magnetic chucks and the like comprising in combination a base adapted to be mounted upon a suitable machine frame, a brush holder comprising a body portion provided with openings through which suitable brushes are adapted to extend,brushes extending through said openings, and at right angles to the face of the brush holder, springs carried by said body portion and bearing upon said brushes in such manner as to normally urge said brushes outwardly through the said openings, electrical connecting members connected to said brushes, and means for rotatably and slidably connecting said body portion with the said base.

10. In a brush holder for rotary magnetic chucks and the like the combination of a supporting base adapted to be mounted on a suitable machine -frame, a brush holder comprising a body portion adapted to support suitable brushes, brushes mounted within said body portion and extending through openings therein, spring means bearing on said brushes, a hollow support upon which said body portion is mounted, electrical connecting means connected with said brushes and extending through said hollow support, and adjustable devices operatively connecting said hollow support with said base whereby the body portion may be adjusted as is desired.

11. In a brush holder for rotary magnetic chucks and the like the combination of a supporting base adapted to be mounted on a suitable machine frame, a hollow brush holder comprising a body portion adapted to support suitable brushes, brushes mounted within said body portion and extending through openings therein, spring means bearing on said brushes, a hollow support upon which said body portion is mounted, electrical connecting means connected with said brushes and extending through said hollow support, and adjustable devices r0- tatably and slidably connecting said hollow support with said base whereby the body portion may be adjusted as is desired.

12. A brush holder for rotary magnetic chucks and the like comprising in combination a body portion, a tubular member adapted to carry said body portion, electrical connecting members connected with said brushes and extending through said hollow supporting member. and a supporting base with which said hollow supporting member is adjustably mounted.

13. A brush holder for rotary magnetic chucks and the like comprising in combination a body portion, brushes mounted upon said body portion, a tubular member adapted to carry said body portion, electrical connecting members connected with said brushes and extending through said hollow supporting member, a supporting base with which said hollow supporting member is adjustably mounted, and an adjustable sleeve connecting the tubular member and the supporting base whereby the body portion may be adjusted.

l i. A brush holder for magnetic chucks or the like comprising in combination a support, a clamp bracket adjustably mounted on said support, and a brush holder slidably and rotatably mounted upon said clamp bracket.

15. In combination a machine frame, a support mounted on the back of said machine frame, a brush holder for magnetic chucks adjustably mounted on said support, a switch mounted on the front of said machine frame, and connector operatively connecting said switch with said brush holder.

FRANK L. SIMMONS. 

